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层状硅酸盐粘土矿物,如蒙脱石、伊利石、高岑石等具有不同的阳离子交换量。在泥质砂岩中,粘土矿物对岩石导电性的影响与岩石的阳离子交换量有关。因而,用岩石的阳离子交换量来校正粘土对岩石导电性的影响是一种有效的方法。目前主要是用化学分析法来确定岩样的阳离子交换量,为测井解释提供参数。我们应用EDTA—铵盐法测量岩样的阳离子交换量得到了满意的结果。测量的岩样阳离子交换量与岩样的自然伽玛强度有明显的相关关系。
Layered silicate clay minerals, such as montmorillonite, illite, high centenite, have different amounts of cation exchange. In shaly sands, the effect of clay minerals on rock conductivity is related to the amount of rock cation exchange. Thus, using the cation exchange capacity of rocks to correct the effect of clay on rock conductivity is an effective method. At present, chemical analysis is mainly used to determine the amount of cation exchange of a rock sample and provide parameters for logging interpretation. We used EDTA-ammonium salt method to measure the cation exchange capacity of the rock sample and got satisfactory results. There was a clear correlation between the measured cation exchange capacity and the natural gamma ray intensity of the rock samples.